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    }

    function assume() {
        if (option.couch) {
            combine(predefined, couch);
        }

        if (option.rhino) {
            combine(predefined, rhino);
        }

        if (option.prototypejs) {
            combine(predefined, prototypejs);
        }

        if (option.node) {
            combine(predefined, node);
            option.globalstrict = true;
        }

        if (option.devel) {
            combine(predefined, devel);
        }

        if (option.dojo) {
            combine(predefined, dojo);
        }

        if (option.browser) {
            combine(predefined, browser);
        }

        if (option.nonstandard) {
            combine(predefined, nonstandard);
        }

        if (option.jquery) {
            combine(predefined, jquery);
        }

        if (option.mootools) {
            combine(predefined, mootools);
        }

        if (option.wsh) {
            combine(predefined, wsh);
        }

        if (option.esnext) {
            useESNextSyntax();
        }

        if (option.globalstrict && option.strict !== false) {
            option.strict = true;
        }
    }


    // Produce an error warning.
    function quit(message, line, chr) {
        var percentage = Math.floor((line / lines.length) * 100);

        throw {
            name: 'JSHintError',
            line: line,
            character: chr,
            message: message + " (" + percentage + "% scanned).",
            raw: message
        };
    }

    function isundef(scope, m, t, a) {
        return JSHINT.undefs.push([scope, m, t, a]);
    }

    function warning(m, t, a, b, c, d) {
        var ch, l, w;
        t = t || nexttoken;
        if (t.id === '(end)') {  // `~
            t = token;
        }
        l = t.line || 0;
        ch = t.from || 0;
        w = {
            id: '(error)',
            raw: m,
            evidence: lines[l - 1] || '',
            line: l,
            character: ch,
            a: a,
            b: b,
            c: c,
            d: d
        };
        w.reason = m.supplant(w);
        JSHINT.errors.push(w);
        if (option.passfail) {
            quit('Stopping. ', l, ch);
        }
        warnings += 1;
        if (warnings >= option.maxerr) {
            quit("Too many errors.", l, ch);
        }
        return w;
    }

    function warningAt(m, l, ch, a, b, c, d) {
        return warning(m, {
            line: l,
            from: ch
        }, a, b, c, d);
    }

    function error(m, t, a, b, c, d) {
        var w = warning(m, t, a, b, c, d);
    }

    function errorAt(m, l, ch, a, b, c, d) {
        return error(m, {
            line: l,
            from: ch
        }, a, b, c, d);
    }



// lexical analysis and token construction